diff --git a/action.yml b/action.yml
index 9002431..b01ddcc 100644
--- a/action.yml
+++ b/action.yml
@@ -24,6 +24,11 @@ runs:
       mkdir -p "$oauth_dir"
       printf '%s' "$OAUTH" | base64 -d > "$oauth_file"
       chmod 600 "$oauth_file"
+      test -s "$oauth_file"
+      echo "::group::Antigravity OAuth debug"
+      stat -c 'oauth_file_mode=%a oauth_file_size=%s' "$oauth_file"
+      sha256sum "$oauth_file" | awk '{ print "oauth_file_sha256=" $1 }'
+      echo "::endgroup::"
     shell: bash
   - name: 執行工具
     id: antigravity